fix: ensure secondary sort by id ascending when sorting by createdAt descending

When events share the same createdAt timestamp, the tiebreaker sort by id
must be ascending to produce a stable, deterministic order. Fixed several
locations that either had no secondary sort, used descending id sort, or
used .reversed() which incorrectly flipped both sort directions.

https://claude.ai/code/session_01RvuyPf1x9wLf2DCgsSXLGz

commons/src/commonMain/kotlin/com/vitorpamplona/amethyst/commons/search/SearchResultFilter.kt

@@ -53,7 +53,7 @@ object SearchResultFilter {
         }
 
         // Sort by createdAt descending
-        return result.sortedByDescending { it.createdAt }
+        return result.sortedWith(compareByDescending<Event> { it.createdAt }.thenBy { it.id })
     }
 
     fun isReply(event: Event): Boolean = event.kind == 1 && event.tags.any { it.size >= 2 && it[0] == "e" }

commons/src/commonMain/kotlin/com/vitorpamplona/amethyst/commons/search/SearchResultSorter.kt

@@ -33,16 +33,16 @@ object SearchResultSorter {
     ): List<Event> =
         when (order) {
             SearchSortOrder.NEWEST -> {
-                events.sortedByDescending { it.createdAt }
+                events.sortedWith(compareByDescending<Event> { it.createdAt }.thenBy { it.id })
             }
 
             SearchSortOrder.OLDEST -> {
-                events.sortedBy { it.createdAt }
+                events.sortedWith(compareBy<Event> { it.createdAt }.thenBy { it.id })
             }
 
             SearchSortOrder.RELEVANCE -> {
                 if (searchText.isBlank()) {
-                    events.sortedByDescending { it.createdAt }
+                    events.sortedWith(compareByDescending<Event> { it.createdAt }.thenBy { it.id })
                 } else {
                     events.sortedByDescending { scoreEvent(it, searchText) }
                 }

commons/src/commonMain/kotlin/com/vitorpamplona/amethyst/commons/ui/notifications/CardFeedState.kt

@@ -75,4 +75,4 @@ sealed class CardFeedState {
  */
 val DefaultCardComparator: Comparator<Card> =
     compareByDescending<Card> { it.createdAt() }
-        .thenByDescending { it.id() }
+        .thenBy { it.id() }